Datasheet

TPS60240, TPS60241
TPS60242, TPS60243
SLVS372B – JUNE 2001 – REVISED JANUARY 2002
15
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APPLICATION INFORMATION
TPS60241
V
IN
C
1
1 µF
C
2
1 µF
C
1+
C
1–
GND
V
OUT
C
2+
C
2–
EN
C
I
1 µF
GND
3.3 V
5 V
C
O
1 µF
VCO
V
CC
GND
Figure 31. 5-V Low-Noise VCO Supply From 3.3-V Input
TPS60240
V
IN
C
1
1 µF
C
2
1 µF
C
1+
C
1–
GND
V
OUT
C
2+
C
2–
EN
GND
2 V
3.3 V
C
O
1 µF
V
O
GND
C
I
1 µF
Figure 32. 2-V to 3.3-V Low-Noise Converter
output voltage ripple
The output voltage ripple depends on the capacitors used. Table 1 illustrates the dependence between output
voltage ripple and capacitor selection.
Table 1. Output Voltage Ripple and Capacitor Selection
C
I
C
O
C
1
C
2
OUTPUT VOLTAGE RIPPLE
[µVrms]
1 µF 1 µF 1 µF 1 µF 288
2.2 µF 2.2 µF 1 µF 1 µF 212
4.7 µF 4.7 µF 1 µF 1 µF 183
4.7 µF 1 µF 1 µF 1 µF 272
1 µF 4.7 µF 1 µF 1 µF 185
NOTE: V
I
= 3.3 V, V
O
= 5 V, R
L
= 500 Ω, T
A
= 25°C